Bump yosys from c8b42b7 to c884624

Bumps [yosys](https://github.com/YosysHQ/yosys) from `c8b42b7` to `c884624`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](YosysHQ/yosys@c8b42b7...c884624)

---
updated-dependencies:
- dependency-name: yosys
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>